P
US5593786AExpiredUtilityPatentIndex 94

Self-adhering polyvinyl chloride safety glass interlayer

Assignee: LIBBEY OWENS FORD COPriority: Nov 9, 1994Filed: Nov 9, 1994Granted: Jan 14, 1997
Est. expiryNov 9, 2014(expired)· nominal 20-yr term from priority
Inventors:PARKER ANTHONY ASTRICKLER DAVID ABARTUS JR STEPHEN PWOLKE SUSAN M
B32B 17/06B32B 17/10036B32B 17/1055Y10T428/31612Y10T428/31909Y10T428/31649Y10T428/3192Y10T428/31645
94
PatentIndex Score
139
Cited by
12
References
30
Claims

Abstract

Laminated safety glass includes a pair of glass sheets bonded together with a self-adhering composite interlayer. The composite interlayer is formed of a support layer including a plasticized PVC containing film and a polymeric adhesive layer on one, or preferably both, of the major surfaces of the support layer. The adhesive layers are formed of a polymeric material which is capable of adhering to the PVC containing support layer and to the glass sheets. The respective refractive indices of the adhesive layers and the support layer are matched as closely as possible in order to eliminate optical distortion caused by interfacial reflections of incident light. A preferred copolymer resin for forming the adhesive layers is poly(vinyl chloride-co-vinyl acetate-co-maleic acid).

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A laminated glazing unit, comprising sequentially: a first glass sheet:   a first adhesive layer including a polymeric material, said adhesive layer having a first refractive index:   a support layer including a plasticized vinyl chloride polymer having a number average molecular of at least about 30,000, said support layer having a second refractive index and a total plasticizer concentration of between about 20 phr to about 60 phr;   a second adhesive layer including a polymeric material: and   a second glass sheet;   wherein said first and said second refractive indices differ by no more than about 0.05.   
     
     
       2. A laminated glazing unit as defined in claim 1, wherein said first and said second refractive indices differ by no more than about 0.04. 
     
     
       3. A laminated glazing unit as defined in claim 1, wherein said first and said second refractive indices differ by no more than about 0.03. 
     
     
       4. A laminated glazing unit as defined in claim 1, wherein said first and said second refractive indices differ by no more than about 0.01. 
     
     
       5. A laminated glazing unit as defined in claim 1, wherein said second adhesive layer has a refractive index which differs from said second refractive index by no more than about 0.05. 
     
     
       6. A laminated glazing unit as defined in claim 1, wherein said first adhesive layer includes a vinyl chloride polymer. 
     
     
       7. A laminated glazing unit as defined in claim 6, wherein said first adhesive layer includes a copolymer of vinyl chloride and a comonomer having acid functional groups. 
     
     
       8. A laminated glazing unit as defined in claim 6, wherein said first adhesive layer includes a copolymer of vinyl chloride, vinyl acetate, and maleic acid. 
     
     
       9. A laminated glazing unit as defined in claim 6, wherein said first adhesive layer includes a copolymer of vinyl chloride, vinyl acetate, and vinyl alcohol. 
     
     
       10. A laminated glazing unit as defined in claim 1, wherein said support layer includes a copolymer of vinyl chloride and methyl acrylate. 
     
     
       11. A laminated glazing unit as defined in claim 1, wherein said support layer includes a copolymer of vinyl chloride and ethylene. 
     
     
       12. A laminated glazing unit as defined in claim 1, wherein said first and second adhesive layers include a silane. 
     
     
       13. A laminated glazing unit as defined in claim 12, wherein said silane is an epoxy silane. 
     
     
       14. A laminated glazing unit as defined in claim 11, wherein said silane is an amino silane. 
     
     
       15. A laminated glazing unit as defined in claim 11, wherein said silane is a mercapto silane. 
     
     
       16. A laminated glazing unit as defined in claim 1, wherein said adhesive layers are not more than about 0.5 mils thick, and said support layer is at least about 10 mils thick. 
     
     
       17. A laminated glazing unit as defined in claim 16, wherein said support layer is at least about 25 mils thick. 
     
     
       18. A laminated glazing unit, comprising sequentially: a first glass sheet;   a first adhesive layer including a polymeric material which is thermodynamically compatible with a vinyl chloride polymer, said polymeric material including at least one functional group which is capable of forming chemical bonds with glass;   a support layer including a vinyl chloride polymer, with the level of vinyl chloride being above 50% by weight of the total monomer mix;   a first adhesive layer including a polymeric material which is themodynamically compatible with said vinyl chloride polymer, said polymeric material including at least one type of functional group which is capable of forming chemical bonds with glass; and   a second glass sheet.   
     
     
       19. A laminated glazing unit as defined in claim 18, wherein said adhesive layer includes a vinyl chloride polymer. 
     
     
       20. A laminated glazing unit as defined in claim 19, wherein said first adhesive layer includes a copolymer of vinyl chloride and a comonomer having acid functional groups. 
     
     
       21. A laminated glazing unit as defined in claim 19, wherein said first adhesive layer includes a copolymer of vinyl chloride, vinyl acetate, and maleic acid. 
     
     
       22. A laminated glazing unit as defined in claim 19, wherein said first adhesive layer includes a copolymer of vinyl chloride, vinyl acetate, and vinyl alcohol. 
     
     
       23. A laminated glazing unit as defined in claim 18 wherein said support layer includes a copolymer of vinyl chloride and ethylene. 
     
     
       24. A laminated glazing unit as defined in claim 18, wherein said support layer includes a copolymer of vinyl chloride and methyl acrylate. 
     
     
       25. A laminated glazing unit as defined in claim 18, wherein said first and second adhesive layers include a silane. 
     
     
       26. A laminated glazing unit as defined in claim 25, wherein said silane is an epoxy silane. 
     
     
       27. A laminated glazing unit as defined in claim 25, wherein said silane is an amino silane. 
     
     
       28. A laminated glazing unit as defined in claim 25, wherein said silane is a mercapto silane. 
     
     
       29. A laminated glazing unit as defined in claim 18, wherein said adhesive layers are not more than about 0.5 mils thick, and said support layer is at least about 10 mils thick. 
     
     
       30. A laminated glazing unit as defined in claim 29, wherein said support layer is at least about 25 mils thick.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.